/Engine/Source/Runtime/MovieScene/Public/EntitySystem/MovieSceneEntityFactory.h
Specifies that if a component is present on a parent entity, the given child component should be created on any child entity.
void DefineChildComponent ( [FComponentTypeID](API\Runtime\MovieScene\EntitySystem\FComponentTypeID) InParentComponent, [FComponentTypeID](API\Runtime\MovieScene\EntitySystem\FComponentTypeID) InChildComponent )